Rotary pump



T. S. PATTERSON' ROTARY PUMP Filed Aug, 29, 1924 2 Sheets-Sheet 1 www5/5'. Pr'som Oct. 18, 1927. 1,645,967

T. S. PATTERSON y ROTARY PUMP Filed Aug. 29, 1924 2 Sheets-Sheet 2 e wenr: TZOHZaS/S fae son 'Patented oci. 18, 1927.

UNITED STATES THOMAS S. PATTERSON, OF MALAGA, NEW JERSEY.

ROTARY PUMP.

Application led August 29, 1924. Serial No. 735,029.

My invention relates to rotary pumps of the type in which a pair of impellers are rotated by suitable means and serve to discharge at varying pressures, depending-'upon the speed at which such impellers are rotated, a liquid body; such body being sup' plied to the impellers without pressure or head, and being lifted and discharged by the rotation of said impellers.A

My improved structure comprises a pair of impellers which are connected to or associated with gearing so as to rotate in unison with each other; each of said impellers comprising a body generally cylindrical, more or less deeply recessed at opposite point-s and provided, at opposite points at right angles to said recesses, with blades which register `with and enter said recesses upon rotation of said impellers. The bodies of the impelleis between the respective blades and recesses are in substantial rollin@ contact having teeth formed thereon the full width of the impellers, which teeth are in mesh and constitute the means ,whereby movement imparted to one impeller ymay be transmitted to the other. In such form of structure there are preferably the same number of teeth formedon the surface of the impeller body between each blade and recess.

A. further object of my invention is to provide a structure of the foregoing type with means for relieving any com ression of the fluid that may be set up tween the blades and the walls of t-he recesses with which said blades register.

A further object of my invention is to provide improved means for supporting such impellers in Heating bearings with improved 0 means for lubricating said earings.

A further object of my invention is to provide floating bushings or sleeves between the impeller journals and the ump casing, between which lubricant may e forced by the pressure'developed upon rotation of said impellers.

A .further object of my invention. is to provide means for introducing lubricant into the casing adjacent the bearings.

And a still further object of my invention 1s to provide a shaft for the impellers which may be splined thereto and with such looseness of'fit as to permit movement of the impeller or shaft with respect to each other longitudinallyof said shaft.

.These and other features of my invention are more fully described hereinafter; reference being had to the accompanying drawings, in which:

Figure 1, is a vertical sect-ion of one form of my improved pump structure.

Fig. 2, is a sectional plan view on the axis of the impellers.

Fig. 3, is a sectional view at right angles to Fig. l; partly on the vertical axis of one of the impellers.

Fig. 4, is a sectional view similar. to Fig. 1, illustrating a modified form of structure within the scope of my invention.

Fig. 5, is a sectional view similar to Fig. 3, of the form of structure illustrated in Fi 4, and

ig. 6, is a sectional .view similar to Fig. I

5, illustrating another detailof construction within the scope of my invention.

In Figs. l, 2 and 3, of the drawings, l represents the casing of the pump structure providing a vchamber -2, having semicy indrical wallsl 3 and 4. The oint of feed or inlet of fiuid being move by the impellers is at 5, and 6 is the discharge outlet which may vcommunicate with a. pipe leading to a reservoir or to any point of discharge.

Within the chamber 2, the impellers 9 and 10 are mounted; the same comprising substantially cylindrical bodies grooved 'at 11 and 12, respectively; such grooves being opposite each other on an axial line passing through the centre of theV impeller bodies.

The casing is recessed at 15, for the reception of the toothed portions of said im 1ers, indicated at 16 and 17, and the pitch line of said gears coincides with the cylindrical surfaces of the impellers, between In addition to said grooves, the impellers are I- .Y rovided with blades 13 and 14g respectively, f

ooves lland los 'l the blades and resses,w1iich Surfaces are adapted, substantially, to roll upon each other. The extremities of the blades are arranged so as to substantially clear the walls of the chamber in which they are mounted.

As illustrated in Figs. 1, 2 and 3, the impellers are provided with trunnions 18 and 18a and 19 and 19, that is to say, supporting members which are integral with the impellers; one of said trunnions or supporting members, that indicated at 19a, being extended through a stuing box 20, having the usual gland 21, adapted to engage packing 22` whereby a fluid tight joint may be maintained, and forming a shaft for connection with a driving element, which connection may be in the form of a flexible coupling of usual type in operative engagement with a prime mover of any suitable design.

The several trunnioiis of the impellers are mounted in loose sleeves or busliin 25, disposed in recesses 26, formed in t e pump casing; such sleeves being shorter than-the recesses so as to provide a space 27, at the ends of the respective sleeves and adjacent to the outer ends of the recesses 26, adapted to receive heavy lubricant; certain of the trunnions being shortened to provide enlarged spaces. In order that such lubricant may be supplied to the spaces 2T, the casing opposite each space carries a grease cup 28, of the pressure type, so that upon said cups being filled with grease and the caps being secured in place under proper conditions common to grease cups of this type, such grease will be forced into the spaces 27, under pressure; the sleeves or bushings having the proper loose fit with respect to recesses 26 and the truiinions, this pressure will cause such sleeves or bushings to be moved toward the impellers in the position shown in the drawings.

Upon rotation of the impellers under the action of the prime mover coupled to the combined shaft and trunnion 19a, pressure will be set up in the chamber2, and this pressure finding its way between the impellers and the walls of the easing and the ends of the sleeves, will cause the latter to move outwardly against the body of lubricant confined in the spaces 27 and such motion of the sleeves will force the lubricant between the latter and the trunnions and between the sleeves and the walls of the recesses 26 in which such bearing sleeves or bushings are mounted. To facilitate the pressure reaching the ends of the sleeves, the impellers may be grooved at 31 and 32; the grooves 32 being annular and disposed opposite the ends of the sleeves, and in some instances the ends of the sleeves adjacent to the impellers may be annularly grooved. It will be undeistood, of course, that the fit of the bushings or sleeves with respect to the walls of the recesses 26 and the trunnions is sufficient-ly loose to permit a film of lubricant to be forced between the same in the manner indicated, although it is not possible to illustrate such looseness of fit in the drawings.

In the structure illustrated in Figs. 1, 2 and 3, the bodies of the impellers are arranged to substantially roll upon each other, and the gearing moving the saine is laterally disposed with respect thereto so as to be out of the way or path of the fluid (or liquid) moved by said impellers. 1n the form of structure illustrated in Figs. 4 and 5, the impellers themselves, indicated at 9 and 10, are directly geared together by teeth 35, extending across the bodies of the respective impellers, and the blades 13a and 14, of the respective. impellers which effect movement of the fluid (or liquid), are additional teeth, which serve to effect movement of one impeller by the other when the teeth 35 are not in mesh. lVhile the number of teeth 35 is not important, there should be the same number between the respective blades 13al and 14 and the recesses formed in the impeller bodies intermediate said blade teeth.

The blade teeth 13 and 14, register with the recesses 11 and 12, in the bodies of the impellers, and their engagement with the walls of these recesses cause movement of one impeller by the other. As the impeller teeth blades when entering these recesses tend to confine a portion of the fluid and asa liquid body is not compressible, means must be provided to allow such fluid (or liquid) to escape, and for this purpose the face of thc blade teeth 131 and 14 is grooved, as indicated at 3G, so as to permit escape of any fluid (or liquid) that may be trapped by said blade teeth. These grooves do not extend over the ends of the blade teeth which, as in the foi-m of structure illust-rated in Figs. 1, 2 and 3, are maintained just out of Contact with the walls of the chamber in which they are located. If desired, by reason of the possibility of the same condition, the blades carried by the impellers in the form of structure illustrated in Figs. 1, 2 and 3, may also be grooved, and if necessary for any purpose both faces of the blades may be grooved.

In all other respects, in regard to the mounting of the same and other features, and the mode of operation, the structure illustrated in Figs. 4 and 5, is similar to that illustrated in Figs. 1, 2 and 3.

1n lieu of the arrangement. shown in Figs. 1, 2 and 3, in which the ti'uiinions are part of or are fixed with respect to the inipeller bodies, and in addition to the sleeves which have movement with respect to said trunnions, I may provide shafts 37 passing through the impellers and spliiied thereto so as to be capable of movement longitudinally with respect to said impellers. or the latter to have sliding `movement longitudinally with respect to said shafts; such form of structure being illustrated in Fig. 6, and the shaft illustrated being the one coupled to the prime mover. In such case the spline, indicated at 38. is shorter than the Width of the. impeller body so that the latter may have movement equal to the clearance between the same and the walls of the casing and in the space formed by such clearance, pressure may find its Way to move the sleeves with respect to the shafts and impeller bodies, or the latter may move with respect to the sleeves. The space in the impeller bodies receiving the spline extends entirely through the same. In this arrangement, the ends of the sleeves may be annularly grooved and the face of the impellers may also be grooved.

In such arrangement, the gears may be 1ndependent of the impellers, and be secured to the shafts by keys or splines carried by the shafts so that the latter will be held against undue longitudinal movement by the engagement of such key with the Wall of the casing.

In the case of the trunnios 19B which is extended and coupled to the driving element and in the case of the shaft 37 also to be coupled withA the driving element, the space receiving the lubricant is an annular one encircling such trunnion and shaft respectively.

It will be understood, of course, that both faces of the impeller bodies may be provided with the grooves 31 and 32, for the passage of pressure to the ends of the sleeves.

I claim:

1. In a rotary pump, the combination of a chambered casing, a pair of impellers mounted therein; each of said impellers comprising substantiall cylindrical bodies with a pair of radially isposedlbla'des andbeing rooved intermediate said blades to accommo ate the blades of the companion impeller, meshing gears for coupling said impellers whereby they may be driven in unison, means for driving said impellers, journals for said impellers, floatin bushings for said journals; said bushings eing of a length to provide spaces at the respective ends of the same, and means for filling said spaces with lubricant; said bushings being movable endwise by thefressure set up by the impellers and dlrecte against the body of lubricant in said spaces to force the same between the journals and said floating bushings and said impellers being grooved for the passage of pressure to said bushings.

2. In a. rotary pump, the combination of a chambered casing, a pair of bladed impellers geared together and mounted therein, means for driving said impellers, ilo-ating shafts for said impellers, floating bushings for said shafts; said bushings being of a length to provide spaces at the respective ends of the same, and means for filling said spaces with lubricant; said bushings being movable end- Wise by the pressure set up by the impellers and directed against the body of lubricant in said spaces to force the same between the floating shafts and bushings.

In witness whereof I have signed this specification.

THOMAS S. PATTERSON. 

